Fix: Incorrect directory path if tool is installed by package

Currently, if we install d1-graphics-tool with a .deb package, it will try
to resolve the path to save a .json file to /usr/bin, since currently we
save the configuration file wherever the binary is. User doesn't have an
access to write to /usr/bin/ directly and this ends up with a problem in
reading/writing to a config, resetting the config everytime app is being
used.

This patch changes it, and leaves the configuration for the file to be
saved in:

Windows: AppData/.config/diasurgical/d1-graphics-tool/ directory path
Otherwise: /home/user/.config/diasurgical/d1-graphics-tool/ directory
path

source/config.cpp

@@ -1,15 +1,26 @@
 #include "config.h"
 
+#include <QDir>
 #include <QCoreApplication>
 #include <QFile>
 #include <QJsonDocument>
 #include <QJsonObject>
+#include <QStandardPaths>
 
 static QJsonObject theConfig;
+QString Config::jsonFilePath;
 
 void Config::loadConfiguration()
 {
-    QString jsonFilePath = QCoreApplication::applicationDirPath() + "/D1GraphicsTool.config.json";
+    // create directories on the path if they do not exist
+    if (!Config::createDirectoriesOnPath()) {
+        qDebug() << "Couldn't resolve path for the config file. Configuration file won't be loaded.";
+        return;
+    }
+
+    // add filename to the absolute path
+    jsonFilePath += "D1GraphicsTool.config.json";
+
     bool configurationModified = false;
 
     // If configuration file exists load it otherwise create it
@@ -41,15 +52,24 @@ void Config::loadConfiguration()
 
 void Config::storeConfiguration()
 {
-    QString jsonFilePath = QCoreApplication::applicationDirPath() + "/D1GraphicsTool.config.json";
-
     QFile saveJson(jsonFilePath);
     saveJson.open(QIODevice::WriteOnly);
     QJsonDocument saveDoc(theConfig);
     saveJson.write(saveDoc.toJson());
     saveJson.close();
 }
 
+bool Config::createDirectoriesOnPath()
+{
+#ifdef Q_OS_WINDOWS
+    jsonFilePath = QStandardPaths::AppLocalDataLocation	+ "/.config/diasurgical/d1-graphics-tool/";
+#else
+    jsonFilePath = QDir::homePath() + "/.config/diasurgical/d1-graphics-tool/";
+#endif
+
+    return QDir().mkpath(jsonFilePath);
+}
+
 QJsonValue Config::value(const QString &name)
 {
     return theConfig.value(name);

source/config.h

@@ -8,4 +8,8 @@ class Config {
     static void storeConfiguration();
     static QJsonValue value(const QString &name);
     static void insert(const QString &key, const QJsonValue &value);
+private:
+    static bool createDirectoriesOnPath();
+
+    static QString jsonFilePath;
 };